WebSocket: open event
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The open event is fired when a connection with a WebSocket is opened.
Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("open", (event) => {});
onopen = (event) => {};
Event type
A generic Event.
Examples
js
// Create WebSocket connection.
const socket = new WebSocket("ws://localhost:8080");
// Connection opened
socket.addEventListener("open", (event) => {
socket.send("Hello Server!");
});
Specifications
| Specification |
|---|
| WebSockets Standard # dom-websocket-onopen |
Browser compatibility
BCD tables only load in the browser